如图,在四棱锥
中,侧面
底面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6aa5124a-26e4-41d1-817e-f74c01b5b707.png?resizew=161)
(Ⅰ)证明:
平面
;
(Ⅱ)若
的面积为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af36689a2d2a5f999b3b5859a3c9faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc129df6024038214f20a53e609a14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6aa5124a-26e4-41d1-817e-f74c01b5b707.png?resizew=161)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f8b463fcecf0a757f386db56e074d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
更新时间:2021-09-24 16:37:07
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】在四棱锥
中,
底面ABCD,
,AB∥DC,
,
,点E为棱PC中点.
(1)证明:
平面PAD;
(2)求直线BE与平面PBD所成角的正弦值;
(3)若F为棱PC上一点,满足
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51fc7d1b20a1ce1761714c1733f0511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b175a9ea8c1c191810c1e324a5a9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fa8832f98b5418a7d75892f7951b8.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db505d50d939e937be5cb06e655e4c0.png)
(2)求直线BE与平面PBD所成角的正弦值;
(3)若F为棱PC上一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a389e0b0232e986d1c341b45e5b28e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1b8317de5fb3c38c59859622f4c4b0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/24f6ed9b-1da0-4b78-81f6-d8c827697669.png?resizew=232)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,四棱锥
,平面
⊥平面
,
是边长为
的等边三角形,底面
是矩形,且
.
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572381214793728/1572381220904960/STEM/85a2929ccaab4f59ab690fb8fa67bf3f.png?resizew=228)
(1)若点
是
的中点,求证:
平面
;
(2)若
为
上任意一点,试问点
在线段
上什么位置时,
;
(3)若点
是
的中点,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572381214793728/1572381220904960/STEM/85a2929ccaab4f59ab690fb8fa67bf3f.png?resizew=228)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb10d645970e5860afd3430957fab6c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b0c9de008a0946fd775a8958ad1db1.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35506ceedd4c34e4e16f360f247bfa86.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图,四棱锥
的底面
是边长为2的正方形,平面
平面
,
是斜边
的长为
的等腰直角三角形,E,F分别是棱
,
的中点,M是棱
上一点,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/0ac1c01c-5a52-458a-a9e9-9fcabbe7b0f6.png?resizew=169)
(1)求证:平面
平面
;
(2)若直线
与平面
所成角的正切值为
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/0ac1c01c-5a52-458a-a9e9-9fcabbe7b0f6.png?resizew=169)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f165b7e8c4d8d5e028b8ffd8f0d26a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dedfba8b9447a4db53baae62fdeebfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbed195d680cddc98a64e3d8258e6d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66058ff40f4ebfc19490eb4e20360752.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图所示,在棱长为1的正方体ABCDA1B1C1D1中,点E是棱BC的中点,点F是棱CD上的动点.试确定点F的位置,使得D1E⊥平面AB1F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/63178415-bdfb-4900-b574-6eaa17c37680.png?resizew=194)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图甲,已知四边形ABCD是直角梯形,E,F分别为线段AD,BC上的点,且满足
,
,
,
.将四边形CDEF沿EF翻折,使得C,D分别到
,
的位置,并且
,如图乙.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/16a650ec-f3f9-4ca4-8bd3-5b507bcef11c.png?resizew=365)
(1)求证:
;
(2)求点E到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d40e403b138555d6a6fe99b26ee7eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dda460b3099274f7ec63376b035c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb79e86ac3a8a4f97e760e2dec04ad8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/16a650ec-f3f9-4ca4-8bd3-5b507bcef11c.png?resizew=365)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21460a8145ad1b2c22eb6d42d706a43e.png)
(2)求点E到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图
,在边长为
的菱形
中,
,点
分别是边
的中点,
,
.沿
将
翻折到
的位置,连接
,得到如图
所示的五棱锥
.
(1)在翻折过程中是否总有平面
平面
?证明你的结论;
(2)在翻折过程中当四棱锥
的体积最大时,求此时点
到平面
的距离;
(3)在(2)的条件下,求二面角的平面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e0b64d25ddd18454f88e40c45d7d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/960936ff4047762dde9f567036887cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e06b8bc2571146b241e6028a742e3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b99271fe84300da304205280de1b63e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d865d5674e5c4e15946e45dce8dc2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/d8af4fee-7227-42b0-9b5b-fe286db50df7.png?resizew=329)
(1)在翻折过程中是否总有平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4180c271831327644dc83240b715b5.png)
(2)在翻折过程中当四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fec03f3187ef8ff985aa8c09088867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ca5b5fd1031438de2d2dd59be8c348.png)
(3)在(2)的条件下,求二面角的平面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6e39e62dad9881e30ac929c1f2958e.png)
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